Valveless pump



G. J.,DOURTE.

VALVELESS PUMP.

APPLlCATION FILED JULY26. 1916.

1 ,3 1 2,962, Patented Aug. 12,1919.

4 $HEETSSHEET 4o 57 2/ 57 T 24 a9 5 54 WITNESS:

G. L DOURTE.

VALVELESS PUMP.

APPLICATION FILED JULY 26, 1916.

1,312,962. Patented A11 12,1919.

4 SHEETS-SHhET 2.

II VI -L n W INVENTOR. G J 000R T5.

ATTORNEY.

ZWITNESS: 60M; 2 2

G. J. DOURTE.

VALVELESS PUMP.

APPLICATION FILED JULY 26. 1916.

Patented Aug. 12,1919.

4 SHEETS-SHEET 3. v

tilt;

"III-Kw IIIIIIIIIIII VIII/III INVENTOR. G. J 00w? TE.

WITNESS: 6 ,2.

G. J. DOURTE.

VALVELESS PUMP.

APPLICATION FILED JULY 26. um.

Patented Aug. 12, 1919.

4 SHEETS-SHEET 4.-

INVENTOR. G. J. 00w? 7'5.

ATTORNEY.

' UNITED STATES PATENT OFFICE. f

GEORGE J. DOURTE, OF DENVE-R, COLORADO.

VALVELESS PUMP.

To all whom it may concern:

Be it known that I, GEORGE J. DoURTE, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Valveless Pumps,

cooperative parts ofthe pump, to simplify its construction and increase its efiiciency in operation.

Principal among these improvements is a piston composed of relatively connected parts which by frictional engagement with the cylinder-wall, insure a water-tight contact at the points of ingress and egress of the displaced liquid. and thus obviate the use of packing devices such as are employed in the construction disclosed in. the. abovementioned patent. v

Another improvement resides in the provision of means for equalizing the water pressure upon the circumferential surface of the rotary and reciprocating piston and thereby minimize the friction to which it is subjected in the operation of the pump.

With the above and other objects in View, all of which will fully appear in the course of the following description, my invention consists of the novel features of construction and arrangement of parts illustrated in the accompanying drawings in. the various views of which like parts are similarlydesignated and in which- Figure 1 represents an'elevation of my improved pump in duplex form,

Fig. 2, a vertical section taken along the line 22, Fig. 1, i

Fig. 3, an enlarged section along the line 3-3, Fig. 2,

Fig. 4, an enlarged section along. the'line 4.4,.Fig. 2,

Figs. 5, 6 and 7, sectional elevations of Specification of Letters Patent. Patented Aug. 12, 1919- 7 Application filed .Tuly 26,1916. ser al 051113423.

one of the pump-cylinders and pistons sh0W- ing the positions the latter assumes at different points in the cycle of operations of the pump, v

Fig. 8, a longitudinal section of one of the pistons,

Fig. 9', a transverse section taken along the line 99,'F1g. 8,

operative arrangement of the parts offa pump of the double-acting balanced type,

Fig. 13, a section taken along the line 13 13, Fig. 12,

Fig. 14, a transverse cylinder and piston shown in Fig. 12' taken along the line 14l4, Fig. 15, a section similar to thatshown in Fig. 14, showing the position of the piston at the ends'of. its strokes, v

Fig. 16, a section similar to that shown in Fig. 14, showing the construction and 'jar rang'ement of the parts in a pump of the single acting balanced type,and V Fig. 17, a section similar to that of Fig,

16 showing the position of the piston in apump of the last-mentioned typeat the end of its up or downward stroke.

- Referring first to the construction shown in Figs. 1 to 10 of the drawings, my improved pump consists of one or more cylinders 2 mounted in a vertical position upon a base'3.

Each cylinder has at its upper end a stuffing-box 4 affording a fluid-tight passage for a piston-rod 5, and in its wall at points intermediate of its ends, diametricallyopposite ports 7 and 6 for the ingress and egress of the liquid displaced in. the operation of the pump.

The ingress-port 7 of the cylinder connects with a conduit 8,which extends into the source of liquid supply, andthe egress port 6 connects with adischarge-conduit 9 which as usual is in communication with an air-chamber 10.

A piston 12 connected with the rod 5 extending through the stufiing-box 4: is longisection through the 7 V 60 Fig. 10, a transverse section along the line i tudinally divided into two complementary halves one of which is rigidly secured at the end of the rod.

The plane along which the piston is divided, is offset, as at 13, to obstruct the flow of liquid between the spaces of the cylinder at opposite sides of the piston, and coiled springs 14 disposed in recesses in the face of one of the halves at which it engages the other half, are provided to force the two parts into frictional engagement with the interior surface of the cylinder in which the piston has its movement.

The springs are preferably arranged in pairs at opposite ends of the piston, and in order to adjust their tension they are placed in engagement with the ends of bolts 15 disposed at the lower end of the piston, in threaded portions of the before-mentioned recesses, and at the opposite end of the same, in threaded openings in the half opposite that which contains the springs.

The piston has, interiorly, two separated channels 16 which serve to connect diametrically opposite, longitudinally extending slot-like openings 17 in the circumferential surface of the piston, respectively with openings 18 in the end faces of the same.

The cylinder is preferably lined with bushing 19 to reduce friction and facilitate adjustment in case of wear.

The piston-and-cylinder construction as described is designed for use in a double-acting pump which delivers water at each single stroke of the piston, and in this re spect varies from the construction shown and described in my above-mentioned patent, which is of the single-acting type and discharges water only at each alternate stroke of the piston.

In the operation of my improved pump, a combined reciprocal and rotary movement is imparted to the piston through the intermediary of a driving mechanism which in principle is similar to that disclosed in United States Patent No. 1,010,604 issued to me on December 5, 1911.

A crank-shaft 3S rotatably mounted in boxes 20 of a standard 42 erected on the base of the pump, is by means of a gear wheel 21 and a pinion 22, operatively connected with a counter-shaft 23 which carries a pulley 24 for its connection with a motor or other source of mechanical energy and which is supported in a box 43 on the same standard.

The piston-rod 5 is at its upper end attached to a cylindrical cross head 25 which has combined reciprocal and rotary movements in a guiding sleeve 26 which is formed integrally with the standard or otherwise secured thereto.

The sleeve is lined with a bushing 27 for the usual purpose and the cross-head has an axial recess open at its upper end to receive the complementary halves of a socketbearing 28 which is part of a universal joint for connecting the cross-head with a connecting rod 29.

The rod 29 has at its lower end a ball 30 which occupies the socket of the bearing and it extends through an opening in the upper end of the same which permits of an oscillatory motion of the rod in following the movement of the crank on the shaft with which its upper end connects.

To compel the cross-head to rotate with the connecting rod and thereby impart a rotary movement to the piston, the ball at the end of the connecting-rod is provided with a slot, and a pin 31 extending loosely through said slot is secured in alined openings in the cross-head as is best shown in Figs. 3 and 4. i

A hollow nut 32 screwed into the threaded upper end of the recess of the cross-head, serves to hold the halves of the socket hearing in their relative positions and may be used to take up wear.

The connecting rod extends at its upper end loosely through a sleeve 33 at the lower end of a yoke 34 which has a head for connection with the wrist 36 on a crank wheel 37 at an end of the before-mentioned crank-shaft 38.

A beveled gear-wheel 39 fixed at the end of the connecting rod between the arms of the yoke, meshes with a similar wheel 40 which is fixed on the before anentioned wrist of the crank-shaft, and a collar 41 on the rod at the opposite end of the sleeve 33, cooperates with the gear-wheel 39 to hold the rod and the yoke against relative displacement.

In the operation of the pump, the piston is by movement of the crank-shaft moved up and downwardly in the cylinder and is at the same time rotated about its longitudinal axis by the cooperative engagement of the beveled gear-wheels, and the ball and socket connection and the cross head.

The beveled gear-wheels are in the present construction, of equal size so that the piston during each stroke will make onehalf a revolution about its axis and complete a revolution during each reciprocating motion.

At the beginning of either its up or downward stroke, the piston is in the positions shown in Figs. 5 and 7 of the drawings, in which its slots are positioned at an angle of 90 with relation tothe ports of the cylinder and in consequence are out of alinement therewith, it being observed that the ports and the slots are of substantially equal width.

When by rotation of the crank shaft the piston is moved up or downwardly, it is at the same time compelled to rotate about its in the end of the piston, into the space ofthe axis. bythe cooperative engagement of the gears 39 and 40, with the result that'while it advances in the cylinder its slotted openings 17 are gradually moved into register withthe respective ports of thesame.

' When the piston has reached the center of its stroke as shown in Fig. 6, its slots are in complete register with the ports, and as the piston continues its movement, they are gradually separated from the; same until at the end of the stroke the ports and slots are again placed out of alinement, and at an angle of 90 with relation to each other.

The liquid drawn into the cylinder through its suction port 7 by the movement of the piston, flows through the respective passage 16 and the corresponding opening 18 discharged through the egress port of the cylinder whilea-similar quantity is drawn in through the ingress ort of the same,oand the quantities of 'water thus intermittently displaced in rapid succession will produce-a substantially continuous flow of liquid at the delivery end of the discharge conduit.

In theconstruction shown in Figs. 1 and 2 of the drawings, two cylinders are mounted on the pump base at opposite sides of the standard, and the pistons in thecylinders are by the mechanism "hereinbe-foredescribed, connected with separated crank wheels on the shaft 38, the wrists-of which are placed at an angle of 90 with relation to each other. p

The ingress and egress ports of the cylinder of the duplex pum thus formed are as usual connected by one intake conduit and one discharge conduit and it will be'understood without further illustrationthat three or more cylinders and pistons. may in like manner be cooperatively combined to form multiplex pumps of any desired-number of units. I v r In order to reduce the friction between the piston and the cylinder inwhich it has its movement and thus increase the efficiency of the machine, I provide the balanced type of pump illustrated in Figs.11 to 17.

Inthis pump the pressure upon the piston is equalized by providing the cylinder with two ingress ports and two egress ports placed respectively opposite to each other, each two ports being connected with a 'cominon conduit for the conveyance of liquid to and from the same as shown in Figs. 14; and 16 I In a pump of thischaracter, it is obviously necessary that the slotted openings in the circiunfcrential surface of the piston are at the endgof the strokes in a position intermediate of the ports in the; cylinder wall, which are disposed at quadrant points thereof; I I

' It follows that the piston must during each stroke rotate through an are of 90 in order to bring its slotsin complete register with the ports or cylinder at the center of the movement and again out of alinement with the same when its movement is completed, and'that in consequence the .piston makes but one-half a revolution during each reciprocation.

To accomplish this result the gears on the shaft and the connecting rods are proportioned as 2 to 1 as is shown. in Fig. 12 of the drawings. i

In a single acting um of the balancedtype (Figs. 16 and 1 the construction of the piston is the same as that of the unbalanced double-actingtype shown in Figs. 1

to 10, but to equalize the pressure. upon the 1 piston in a double-acting pump, by doubling the ingress and egress ports of its cylinder, it is necessary that the piston have four 0 enin s and corres iondin assa 'es'to a: l a p correspond with the ports in the'cylinder inwhichit has its movement.

A'construction of this kind has been illustrated in Figs. 12 to 15 in which thepiston has four separated passages connecting with slots disposed at quadrant points of its peripheral surface. 1 i V "Two opposite passages connect with openings at one end of the piston and the two other passages connectwith openings at the opposite end ofv the same. V The operation. of pumps of the balanced type is the same as that of the first-described pum of the unbalanced type with the exception that in duplex pumps of the balanced type, the cranks on the cross head areplaced at an angle of 180 with relation to each other. r

Having thus described my invention in the best forms at presentknown tome I desireit understood that many variationsin. "the construction and arrangement of its parts may be made without departing; from the sp rit of the invention or sacrificing-any of the advantages of the same.

7 It may, for example, be found necessary under certain conditions to change the continuous rotary movement of the piston. to a reciprocating rotary motion, by automatically reversing its direction of rotation: at

thecrank-shaft.

" 'It'mayalso-be found advantageousto ropredetermined, points in the revolution ofplete registration with the cylinder ports during the greater extent of its reciprocating motion.

Movements for accomplishing these objects have been fully shown and described in my Patent No. 1,010,604 hereinbefore referred to, and the modifications have for that reason not been illustrated in the present application.

Having thus described my invention what I claim and desire to secure by Letters-Patent is:

1. In combination, a cylinder having oppositely disposed ingress-ports and an egress-port, a piston to reciprocate in said cylinder, having openings adapted to register simultaneously with said ingress ports and to register with said egress-port, and passages connecting said openings with the interior of the cylinder, mechanism to reciprocate the piston, and means to simultaneously rotate the same, whereby to bring the openings of the piston in register with the ports of the cylinder during determinate periods in its reciprocal motion.

2. In combination, a cylinder having oppositely disposed ingress-ports and oppositely disposed egress-ports, a piston to reciprocate in said cylinder, having openings adapted to register with said ingress ports and with said egress ports, and passages connecting said openings with the interior of the cylinder, mechanism to reciprocate the piston, and means to simultaneously rotate the same, whereby to bring the openings of the piston in register with the ports of the cylinder during determinate periods in its reciprocal motion.

3. In combination, a cylinder having oppositely disposed ingress ports and an egressport, a piston to reciprocate in the cylinder, having two pairs of oppositely disposed openings to register simultaneously with said ports, and passages connecting said openings with the spaces of the cylinder at opposite sides of the piston, mechanism for reciprocating the piston, and means to simultaneously rotate the same whereby to bring the openings of the piston in register with the ports of the cylinder during determinate periods in its reciprocating movement.

4:. In combination, a cylinder having oppositely disposed ingress-ports, and oppositely disposed egress-ports, a piston to reciprocate in the cylinder, having two pairs of oppositely disposed openings to register simultaneously with; said ports, and passages connecting said openings with the spaces of the cylinder at opposite sides of the piston, mechanism for reciprocating the piston, and means to simultaneously rotate the same whereby to bring the openings of the piston in register with the ports of the cylinder during determinate periods in its reciprocating movement.

5. In combination, a ported cylinder, and a piston to reciprocate in said cylinder, adapted to cover and uncover the ports of the same and composed of parts one of which is recessed, springs in the recesses for continuously forcing said parts into fluidtight engagement with, the cylinder, and screws providing abutments for said springs and capable of adjustment to vary the tension of the same.

6. In a pump of the character described,

the combination with a ported cylinder, of a.

cylindrical piston fitted therein for reciprocation and provided with ports to register with the ports of the cylinder, said piston being longitudinally divided into two halves each having a port in its circumference, an opening in one of its ends, and a passage connecting said port and said opening, a piston-rod attached to one of said halves, and springs between said halves to continuously force them into fluid-tight engagement with the cylinder.

7. In a pump of the character described, the combination with a ported cylinder, of a cylindrical piston fitted therein for reciprocation and provided with ports to register with the ports of the cylinder, said piston being longitudinally divided into two halves each having a port in'its circumference, an opening in one of its ends, and apassage connecting said port and said opening, a piston-rod attached to one ofsaid halves, and springs between said halves to continuously force them into fluid-tight engagement with the cylinder, there being recesses in said piston-halves for the reception of said springs.

8. In a pump of the character described, the combination with a ported cylinder of a cylindrical piston fitted therein for reciprocation and provided with ports to register with the ports of the cylinder, said piston being longitudinally divided into two halves each having a port in its circumference, an opening in one of its ends, and a passage connecting said port and said opening, a

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

